PS4 Error (CE-34878-0) On Call Of Duty Warzone & Modern Warfare

Published by Activision and developed by several different studios over time, Call of Duty is one of the most popular first-person shooter franchises available with sixteen different installments in the series. But unfortunately, PS4 users who bought the WarZone and Modern Warfare installments increasingly encounter a problem playing their games on the PS4. It’s reported that PS4 error code (CE-34878-0) would occur during the gameplay of Warzone and Modern Warfare which would stop the game and keep users unable to continue playing.

Call Of Duty Warzone and Modern Warfare

In fact, PS4 Error (CE-34878-0) doesn’t only occur in Call Of Duty WarZone and Modern Warfare. Rather, a wide variety of PS4 games undergo the same exact issue, so just don’t initially suspect your game as your PS4 system data or one of the PS4 hardware components might be affected.

What Does PS4 Error (CE-34878-0) Mean On Warzone and Modern Warfare?

PS4 Error (CE-34878-0) can occur either during the gameplay or once you launch your games. It depends on the cause of this problem. If, for instance, you can successfully run Warzone or Modern Warfare then after a while of playing you get that error, it’s a strong indication that your PS4 hard drive is malfunctioning. Otherwise, if you get a PS4 Error (CE-34878-0) once you try to launch Warzone or Modern Warfare, it may indicate that your game installation is corrupted. You just can’t be sure until you conduct several tests in order to find out what exactly causes that error.

Call of Duty - Modern Warfare

But in brief, when you get PS4 Error (CE-34878-0) on Warzone, Modern Warfare, or any other PS4 game, it means that there’s a sort of data corruption going on and that the PS4 system fails to process the corrupted data. This corrupted data can be either in the game core files or even the system software files (if the corruption is in the system files, you will get that error always when you try to play any game).

Fixing PS4 Error (CE-34878-0) On Warzone and Modern Warfare

So, this is time to fix the PS4 Error (CE-34878-0) you get On your Call-Of-Duty Warzone and Modern Warfare. If you need more elaboration on this error and additional details on how to implement these methods, please visit our PS4 Error (CE-34878-0) Fix Guide.

PS4 Error Code (CE-34878-0) on Call Of Duty - Modern Warfare

1. Restart the PS4

When you get any type of error on PS4, the very first thing to try is to restart it. This will clear the RAM and cache memory from any bad files and give a new fresh start to the PS4 system. You need to completely turn off your PS4 and disconnect it from power. That’s important in order to clear any electrical power remanents in the hardware components, which will help also improve their performance in the next start.

What you have to do at this post is as follows:

  1. Turn off the PS4.
  2. Unplug the PS4 power cord from the wall power outlet or from the power strip.
  3. Unplug any peripheral connected to your PS4, including the controller and external HDD.
  4. Leave the console in this disconnection state for 3 minutes.
  5. Connect the PS4 to power, and connect the PS4 controller to it while other devices are still disconnected.
  6. Turn on the PS4 and wait for the system to get fully loaded.
  7. If your games are installed externally, connect the external HDD to the PS4 at this point.

Now, try to run your Call of Duty Warzone or Modern Warfare games and see whether this method has resolved the issue or not. If not, try the other methods below.

2. Move Your Games To the Internal HDD

In case you’re getting PS4 Error (CE-34878-0) when playing/launching Warzone or Modern Warfare from an external HDD, it’s strongly recommended that you move it to the local internal HDD of PS4.

3. Stay Up To Date

Make sure that your PS4 system software is up to date and so is your Warzone or Modern Warefare game. The PS4 Error (CE-34878-0) might be caused by file conflicts or incompatibility issues with the currently-installed PS4 system software version.

Updating the PS4 system software or the game itself might fix PS4 Error (CE-34878-0) as an update usually comes with bug fixes for common issues.

4. Reinstall the Game

The installation of your Warzone or Modern Warfare game might be corrupted or missing some core files. It’s wise in this situation to entirely delete the game and reinstall it from scratch.

installing Call of Duty Modern Warfare

If you’ve bought the digital copy of Warzone or Modern warfare and you’re going to download it from the Internet, make sure you have a stable and fast internet connection. We don’t recommend at all connecting to WiFi while downloading huge games.

On the other hand, if you own the disc copy of Warzone or Modern Warfare, make sure the disc is not scratched or dirty before reinstalling the game. It’s recommended to disconnect your console from the internet until the reinstallation process is complete.

5. Maintain Free Space On The PS4 Internal HDD

When the PS4 internal hard drive is full, errors may occur, and since Warzone and Modern Warfare games need lots of storage space to run properly, a shortage in space might cause serious data processing errors.

Therefore, free up your PS4 internal hard drive and keep at least 10% of the total available space FREE and unusable.

6. Rebuild the PS4 Database

One of the effective ways to fix the PS4 Error (CE-34878-0) on Call Of Duty Warzone and Modern Warfare is to rebuild the PS4 database, as that process has proven to resolve many performance issues in the PS4 system and eliminated different types of errors (read more).

We strongly recommend that you don’t rebuild the PS4 database until you move your Warzone or Modern Warfare to the internal HDD of PS4 in case they are installed externally.

Additionally, we also strongly recommend you rebuild the PS4 database if you’ve updated or reinstalled your games in pursuit to fix PS4 Error (CE-34878-0).

After you finish rebuilding the PS4 database, you need to restart your PS4 and check if this has fixed the PS4 Error (CE-34878-0) on Warzone or Modern Warfare.

7. Full Initialize the PS4

If nothing has worked for you to fix PS4 Error (CE-34878-0) on Warzone or Modern Warfare, you have to full initialize the PS4 and reinstall a new, clean copy of the PS4 system software from scratch. This process will eliminate any issue caused by missing/damaged system files.

In fact, every PS4 user must initialize the PS4 at least once a year in order to maintain the peak performance of the system.

Once this process is done, the very first game to install is the one that you have a problem with. Make sure the game is updated to the latest version as well.

8. Format the PS4 Internal HDD

This is the last resort before you contact PlayStation Support or the game developers. In many cases, fully formatting the PS4 internal hard drive has fixed serious errors in the PS4 system that nothing else could do. It’s because there might be some bad sectors on your PS4 hard drive that cause this data corruption/damage error in Warzone or Modern Warfare, and formatting will disable these bad sectors
and restore the original performance of the hard drive.

If you’re not tech-savvy, seek the assistance of one to help you pull out the PS4 internal HDD and connect it to a PC in order to format it.

9. Contact the Game Developers

There might be a bug in the game you’re playing that causes either a functionality issue in the game or an incompatibility issue with the currently-installed PS4 system software version. The best thing to do here is to go to Activision Online Support Center and explain your exact problem to the game developers.


Fixing the PS4 Error (CE-34878-0) On Call Of Duty Warzone and Modern Warfare is not always the same thing. It depends on the reason why data corruption is occurring in the PS4. For that reason you have to run several tests in order to find out the real cause and try, accordingly, to fix it.

You can always seek help from our team. Just comment below if you need any further assistance and we’ll be more than happy to help.

PS4 Error (CE-34878-0) Warzone & Modern Warfare FAQ

Why Am I Getting Error (CE-34878-0) While Playing Warzone and Modern Warfare?

When you get PS4 Error (CE-34878-0) while playing Warzone or Modern Warfare, it indicates that there's a sort of data corruption in the PS4 system or the game itself.

How to Fix PS4 Error (CE-34878-0) on Warzone or Modern Warfare?

Fixing PS4 Error (CE-34878-0) on Call of Duty Warzone and Modern Warfare is not always easy, as it depends on the reason for that problem. This problem mainly occurs because of data corruption, but the real trick here is to figure out what causes that corruption. This article offers several methods to work around PS4 Error (CE-34878-0) on Warzone and Modern Warfare.

Must I Initialize my PS4 when I get PS4 Error (CE-34878-0)?

It's not always necessary to initialize your PS4 in order to fix PS4 Error (CE-34878-0) on Warzone or Modern Warfare. Actually this is almost the last resort when anything else doesn't work.

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